ISO 17043

The main aim of proficiency testing is to:

• provide precision estimates for individual tests.

• assess laboratories ability to competently perform tests or calibrations.

• replace laboratories’ internal quality assurance procedures.

• provide information on different methods.

The main purpose of homogeneity testing is to:

• determine the quality of the samples.

• indicate any significant differences between the samples.

• provide consensus values for the proficiency program.

• provide reference data for the program.

Proficiency testing is defined in ISO/IEC 17043 as

• evaluation of participant performance against pre-established criteria by means of interlaboratory comparisons.

• a means to assign values to reference materials.

• organisation, performance and evaluation of tests on the same or similar test items by two or more laboratories in accordance with predetermined conditions.

• a means of identifying testing problems.

What factor does not influence the statistical design of a proficiency testing program?

• the accuracy of the tests involved.

• the number of samples to be tested.

• the number of participating laboratories.

• packaging and handling.

Laboratory performance in PT programs can based on the comparison of laboratory results with:

• the median value of all participants results.

• homogeneity data.

• a reference value provided by one laboratory.

• none of the above.

Which of the following should be included in the instructions sheet supplied with the samples

• the code numbers of all participating laboratories.

• the units of measurement to be reported

• the identity of the sample supplier

• all of the above

The program coordinator should not advise laboratories in the notification letter (letter of intent):

• the expected schedule for the program

• name and address of the coordinator

• the tests to be conducted.

• the statistical design of the program

The benefits of proficiency testing do not include:

• improved performance by laboratories.

• commercial gain for laboratories.

• replacing expensive on-site assessments.

• a way of identifying technical competence.

Difficulties associated with proficiency testing include:

• high costs.

• transportation of samples (e.g. dangerous goods).

• “special treatment” by laboratories of known proficiency samples.

• all of the above.

Which of the following procedures is not recommended for assigning a value to proficiency test items:

• median of all participants results.

• mean value from homogeneity data.

• reference value from national institute.

• value from certified reference material.